Learned Hand was a federal judge who sat on the United States District Court for the Southern District of New York and then the Second Circuit Court of Appeals from 1909 until his death in 1961, and whose opinions on negligence, free speech, antitrust, and copyright shaped American law so deeply that contemporaries called him the “Tenth Justice” even though he never sat on the Supreme Court. His negligence formula is taught in every first-year torts class. His framework for separating protectable expression from unprotectable ideas still governs copyright disputes. His reading of the Sherman Act set the market-share thresholds courts reference when deciding what counts as a monopoly. For a judge who spent his entire career one rung below the highest court, the reach is unusual.
Who He Was
Billings Learned Hand was born in Albany, New York, in 1872, into a family already established in law. He took a bachelor’s and master’s at Harvard College in 1893 and a law degree from Harvard Law School in 1896. After practicing in Albany and then New York City, he was appointed to the Southern District of New York by President William Howard Taft in 1909 at age thirty-seven, one of the youngest federal judges in the country.1Federal Judicial Center. Hand, Learned President Calvin Coolidge elevated him to the Second Circuit in December 1924. He stepped down from active service on June 1, 1951, but continued hearing cases until shortly before his death in 1961.2Harry S. Truman Library. Letter to Judge Learned Hand on His Retirement From Active Service Across those decades he authored thousands of opinions.
His guiding instinct was judicial restraint. Courts interpret, legislatures legislate, and a judge who dresses up personal policy preferences as constitutional reasoning weakens the whole structure. That conviction runs through nearly everything he wrote, including the one opinion he probably wished he hadn’t.
The Hand Formula for Negligence
Hand’s single most famous contribution came in United States v. Carroll Towing Co. (1947). A barge called the Anna C broke free from its moorings in New York Harbor, struck a tanker, ruptured its hull, dumped a cargo of flour, and sank.3Justia. United States v. Carroll Towing Co. The question was whether the barge owner should have kept someone aboard.
Hand turned the answer into a formula. He identified three variables: the burden of taking adequate precautions (B), the probability the accident will occur without them (P), and the gravity of the resulting loss (L). A defendant is negligent when B is less than P multiplied by L.3Justia. United States v. Carroll Towing Co. When the cost of prevention is small and the expected harm large, failing to take the precaution is unreasonable.
The formula is easier to recite than to apply. Probability and burden are hard to quantify in real disputes, and small errors in estimating either can flip the result. The framework also says nothing about whether a riskier activity should take place at all, only about whether precautions were adequate once it did. Hand framed it modestly, writing that the formula “possibly serves to bring this notion into relief.” Its lasting value is as a way of thinking: when safety is cheap and the stakes are high, you take the precaution.
Free Speech: Masses and the Dennis Retreat
Hand’s earliest major mark on free speech came in Masses Publishing Co. v. Patten (1917). The New York City postmaster had blocked distribution of a socialist magazine containing anti-war cartoons, articles, and poems praising conscientious objectors, on the theory that the material violated the Espionage Act of 1917 by encouraging resistance to the draft.
Hand ruled against the postmaster. The prevailing “bad tendency” tests of the era let the government suppress speech on the mere possibility it might lead someone to break the law. Hand drew a sharper line: speech could be suppressed only when it explicitly urged listeners to violate the law. Criticizing a war, praising those who opposed it, or arguing a law was unjust did not cross that line unless the speaker directly counseled illegal action. The Second Circuit reversed him almost immediately. His standard sat dormant for decades. In 1969 the Supreme Court adopted a closely related approach in Brandenburg v. Ohio, holding that advocacy of illegal action cannot be punished unless directed to producing imminent lawless action and likely to do so. Hand had died eight years earlier.
The story is not only vindication. In United States v. Dennis (1950), writing for the Second Circuit at the height of the Cold War, Hand upheld the convictions of Communist Party leaders under the Smith Act for conspiring to advocate overthrow of the government. He wrote that courts “must ask whether the gravity of the ‘evil,’ discounted by its improbability, justifies such invasion of free speech as is necessary to avoid the danger.”4Justia. United States v. Dennis The formulation sounds analytical, but in practice it gave the government wide room to suppress speech about revolutionary ideas by inflating the “gravity” side. Hand appears to have been following Supreme Court precedent rather than his own instincts. It is the most uncomfortable moment in his career, and it shows the real cost of the restraint he preached: sometimes the law a judge is bound to follow produces a result he knows is wrong.
Alcoa and the Rules of Monopoly
Hand’s 1945 opinion in United States v. Aluminum Company of America rewrote monopoly analysis under the Sherman Antitrust Act. The case reached the Second Circuit only because so many Supreme Court justices had recused themselves that the Court lacked a quorum, and Congress passed a special statute routing the appeal downward.
Alcoa controlled over ninety percent of the virgin aluminum ingot market in the United States. The company argued it had earned its position through superior efficiency and should not be liable for monopolization. Hand rejected the defense. Ninety percent of a market was enough to constitute a monopoly, he held, and Alcoa’s practice of “progressively embracing each new opportunity as it opened,” meeting every potential competitor with capacity already in place, amounted to effective exclusion regardless of whether the company’s intentions were innocent.5Justia. United States v. Aluminum Co. of America He acknowledged a narrow exception for a monopoly arising purely by accident, without any planning, but called it an “empty” exception in practice because successful companies always plan to outperform rivals.
The opinion also addressed market definition, rejecting Alcoa’s argument that recycled scrap aluminum should be counted alongside virgin ingot in calculating share.5Justia. United States v. Aluminum Co. of America The thresholds Hand set remain reference points: ninety percent of a market is clearly a monopoly, sixty percent is doubtful, and thirty-three percent is not.
Copyright: Where Expression Ends and Ideas Begin
Two Hand opinions shaped the copyright frameworks courts still use.
The Abstractions Test
In Nichols v. Universal Pictures Corp. (1930), the plaintiff claimed a Universal motion picture had infringed her play by using a similar plot about feuding Irish and Jewish families whose children secretly marry. Hand asked where protectable expression ends and unprotectable idea begins. His answer was to imagine a work as a series of layers running from the most specific details up to the most general theme. At the bottom sit particular characters, dialogue, and scenes, clearly protectable. At the top sits the bare idea of “feuding families, young lovers,” which belongs to everyone. Somewhere between, the layers stop being expression and start being ideas. A court’s task is to figure out where that line falls.6Justia. Nichols v. Universal Pictures Corp. Hand ruled against the plaintiff, finding the similarities existed only at a level too abstract for protection. Courts still apply the test whenever someone claims a movie, novel, song, or software program copies the structure of their work without lifting the literal text.
Apportioning Profits
Hand’s earlier work on Sheldon v. Metro-Goldwyn Pictures Corp. reached the Supreme Court, which affirmed his approach in 1940. The question was how to measure damages when a studio infringed a playwright’s work but added enormous value through its own actors, sets, and production. The Court held that a copyright owner is entitled only to the share of profits actually caused by the infringement, not a windfall based on the studio’s total revenue.7Justia. Sheldon v. Metro-Goldwyn Pictures Corp. Mathematical precision is not required; a reasonable approximation based on the evidence is enough. The playwright in that case received one-fifth of the net profits.
The Spirit of Liberty
Hand’s most quoted words came not from a courtroom but from Central Park. On a spring Sunday in 1944, weeks before D-Day, roughly a hundred and fifty thousand newly naturalized citizens assembled for an “I Am an American Day” ceremony. Hand, then seventy-two, delivered a speech of barely five hundred words.
Its central passage: “The spirit of liberty is the spirit which is not too sure that it is right; the spirit of liberty is the spirit which seeks to understand the mind of other men and women; the spirit of liberty is the spirit which weighs their interests alongside its own without bias.” He warned against placing too much faith in legal machinery alone: “Liberty lies in the hearts of men and women; when it dies there, no constitution, no law, no court can even do much to help it.” Reprints appeared in The New York Times Magazine, Life, and Reader’s Digest, and the Virginia State Bar Association compared it to the Gettysburg Address. For a judge who had argued his whole career that courts should not be the primary guardians of liberty, it was a consistent message. The law creates space for freedom. It cannot manufacture the civic character that sustains it.
Why He Never Reached the Supreme Court
Seven presidents passed Hand over for the Supreme Court.1Federal Judicial Center. Hand, Learned The reasons combined bad luck and bad timing. During the years his reputation peaked, three sitting justices — Hughes, Stone, and Cardozo — were all from New York, making another New York appointment awkward. By the time seats opened, Franklin Roosevelt felt caught by his own court-packing rhetoric about needing younger blood on the Court and would not appoint a man in his seventies.
The nickname “Tenth Justice” stuck because it named something obvious. Hand’s opinions were cited more often, by more courts, than those of many sitting justices of his era. His negligence formula, his abstractions test, his incitement standard, and his monopoly thresholds became more consequential than most actual Supreme Court opinions of the same period. He served the federal judiciary for more than half a century and died in 1961 at eighty-nine.